Well I'd just like to know how many of the members who have responded here are copyrite attorneys?  On what authority or fact are the answers based upon?  I'd love to see some text or links directing the OP to these rules.  Far as I can tell, the only person making any "reasonable" sense is Gate.  Granted his spelling sux (yes I spelled "sux" wrong... I did it on purpose), but you can OBVIOUSLY tell that English is not his primary langauge.  So rather than make his spelling an issue, just stay focussed on the question at hand.  If a person isn't able to use their brain to debate or, at the very least, display a small measure of tolerance, then they ought to just keep their mouth shut.    

The advice that Ragtopjohnny got from the Art Room Tattoo Galary appears to be sound.  However, to be safe, he could contact the copyrite holder and request permission to use their designs for commercial digital models, get it in writing and provide that to Renderosity for them to "keep on file," just as ShanaC does.

Seems some of the answers to this simple question were made much more complicated than was necessary.

Vive Bene.  Spesso L'Amore.  Di Risata Molto.
Live Well.  Love Often.  Laugh Much.